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ASSERTION FAILED robot_localization error

Hi everyone. I am trying to run the package robot_localization however when I use my launch file it gives me this error;

[FATAL] [1542859479.759800234]: ASSERTION FAILED
file = /home/pg/ugv01_ws/src/maps_nav/robot_localization/src/ros_filter.cpp
line = 2313
cond = topicConfig.getType() == XmlRpc::XmlRpcValue::TypeArray

[FATAL] [1542859479.769316425]: ASSERTION FAILED
file = /home/pg/ugv01_ws/src/maps_nav/robot_localization/src/ros_filter.cpp
line = 2313
cond = topicConfig.getType() == XmlRpc::XmlRpcValue::TypeArray

[localisation/ekf_cont-2] process has died [pid 12445, exit code -5, cmd /home/pg/ugv01_ws/devel/lib/robot_localization/ekf_localization_node __name:=ekf_cont __log:=/home/pg/.ros/log/e35b3192-ee06-11e8-8312-78d00423a161/localisation-ekf_cont-2.log].
log file: /home/pg/.ros/log/e35b3192-ee06-11e8-8312-78d00423a161/localisation-ekf_cont-2*.log
 [localisation/ekf_disc-3] process has died [pid 12447, exit code -5, cmd /home/pg/ugv01_ws/devel/lib/robot_localization/ekf_localization_node odometry/filtered:=odometry/filtered_disc __name:=ekf_disc __log:=/home/pg/.ros/log/e35b3192-ee06-11e8-8312-78d00423a161/localisation-ekf_disc-3.log].
log file: /home/pg/.ros/log/e35b3192-ee06-11e8-8312-78d00423a161/localisation-ekf_disc-3*.log

Please help me to understand why this error is occurring and what steps I can take to resolve the issue?

Thank you in advance